發(fā)布時間：2018-01-23 23:55

  本文關(guān)鍵詞： 機網(wǎng)協(xié)調(diào) 共振機理 低頻振蕩 調(diào)速系統(tǒng) 汽輪機熱力系統(tǒng) GPSS　出處：《華南理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：電力系統(tǒng)互聯(lián)能有效提高系統(tǒng)的經(jīng)濟性和可靠性，而大電網(wǎng)互聯(lián)后復雜的網(wǎng)架結(jié)構(gòu)也帶來了較多的動態(tài)穩(wěn)定問題。低頻振蕩問題作為大電網(wǎng)互聯(lián)后最可能發(fā)生的穩(wěn)定問題，是威脅電網(wǎng)安全穩(wěn)定運行的重要問題之一。 目前，對負阻尼機理的低頻振蕩較為常見，且相關(guān)理論較為成熟。普遍認為裝設(shè)電力系統(tǒng)穩(wěn)定器(PSS)為系統(tǒng)提供適當?shù)恼�阻尼能有效的抑制低頻振蕩的發(fā)生。實際運行經(jīng)驗表明，負阻尼機理在某些類型的低頻振蕩中將不再適用。 本文在分析低頻振蕩傳統(tǒng)機理的基礎(chǔ)上，全面的闡述了共振型低頻振蕩的概念，并對共振機理與負阻尼機理低頻振蕩的特征判別進行了研究。基于機網(wǎng)協(xié)調(diào)考慮對電網(wǎng)側(cè)、機組側(cè)各種形式的擾動對低頻振蕩的影響進行了分析，并綜合考慮汽輪機、調(diào)速系統(tǒng)和電力系統(tǒng)之間的相互影響，從汽輪機及其調(diào)速系統(tǒng)中尋找共振機理低頻振蕩可能的擾動源，即造成機械功率周期性波動的原因。并通過仿真得出了汽輪機調(diào)速系統(tǒng)的擺動以及汽輪機蒸汽壓力脈動對機組機械功率的影響及其與電力系統(tǒng)共振機理低頻振蕩的關(guān)系。 本文打破以往研究低頻振蕩時忽略調(diào)速系統(tǒng)及汽輪機熱力系統(tǒng)對電力系統(tǒng)的影響而孤立的研究電力系統(tǒng)，并通過理論推導、仿真研究和實例分析指出：調(diào)速系統(tǒng)及汽輪機的各環(huán)節(jié)和參數(shù)設(shè)置不當或者由于某些機械故障可能會造成汽輪機組機械功率發(fā)生相應(yīng)波動，進而可能引發(fā)電力系統(tǒng)共振機理的低頻振蕩；不同位置相同擾動量情況下，機側(cè)較網(wǎng)側(cè)的影響更為嚴重。這種類型的低頻振蕩運用PSS進行抑制，，效果不甚理想，需要在調(diào)速系統(tǒng)中設(shè)計并安裝GPSS達到比較好的抑制效果。
[Abstract]:Power system interconnection can effectively improve the economy and reliability of the system. The complex grid structure after the interconnection of large power grid also brings more dynamic stability problems. Low frequency oscillation is the most likely stability problem after the interconnection of large power grid. It is one of the important problems threatening the safe and stable operation of power grid. At present, low frequency oscillation of negative damping mechanism is more common. It is generally considered that the installation of power system stabilizer (PSS) can effectively restrain the occurrence of low frequency oscillation by providing proper positive damping for the system. The negative damping mechanism will no longer be applicable to some types of low frequency oscillations. Based on the analysis of the traditional mechanism of low frequency oscillation, the concept of resonance low frequency oscillation is expounded in this paper. The characteristic discrimination of resonance mechanism and negative damping mechanism of low frequency oscillation is studied. Based on the consideration of power grid coordination, the influence of various types of disturbances on low frequency oscillation on the power grid side and the unit side is analyzed. Considering the interaction among steam turbine, speed regulating system and power system, the possible disturbance source of resonance mechanism low frequency oscillation is found from steam turbine and its governing system. The reason of periodic fluctuation of mechanical power is obtained by simulation, and the influence of turbine governing system swing and steam pressure pulsation on the mechanical power of turbine and the low frequency oscillation of resonance mechanism between turbine and power system are obtained. The relationship. This paper breaks the previous study of low-frequency oscillation ignore the speed control system and steam turbine thermal system on the power system and isolated research power system, and through theoretical derivation. The simulation research and the analysis of examples show that the mechanical power of steam turbine may fluctuate due to the improper setting of various links and parameters of the governing system and steam turbine or because of some mechanical faults. Furthermore, the low frequency oscillation of the resonance mechanism of power system may be initiated. Under the condition of the same disturbance quantity at different positions, the influence of the engine side is more serious than that of the network side. This type of low frequency oscillation is suppressed by PSS, and the effect is not very satisfactory. Need to design and install GPSS in the speed control system to achieve better suppression effect.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM712

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